A vehicle covers a total distance of 280 km. It finishes the first 120 km at 40 km/h and the remaining 160 km at 80 km/h. Find its average speed. MCQ with Answer and Explanation
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Question #1
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A train 270 meters long is moving at a speed of 120 km/h. In how much time will it cross a man coming from the opposite direction at a speed of 15 km/h?
Correct Answer: Option A
Explanation:
Relative speed = 120 + 15 = 135 km/h = 135 * (5/18) = 37.5 m/s. Time = Distance / Speed = 270 / 37.5 = 7.2 seconds.
Relative speed = 120 + 15 = 135 km/h = 135 * (5/18) = 37.5 m/s. Time = Distance / Speed = 270 / 37.5 = 7.2 seconds.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A train 125 meters long passes a running man in 10 seconds when both move in the same direction. If the speed of the man is 5 km/h, find the speed of the train.
Correct Answer: Option D
Explanation:
Relative speed = 125 / 10 = 12.5 m/s = (12.5) * (18/5) = 45 km/h. In the same direction, Relative Speed = Speed of train - Speed of man => 45 = Speed of train - 5 => Speed of train = 50 km/h.
Relative speed = 125 / 10 = 12.5 m/s = (12.5) * (18/5) = 45 km/h. In the same direction, Relative Speed = Speed of train - Speed of man => 45 = Speed of train - 5 => Speed of train = 50 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A mechanical wheel has a radius of 7 cm. How many revolutions are required to cover a linear distance of 44 meters?
Correct Answer: Option C
Explanation:
Circumference of the wheel = 2 * (22/7) * 7 = 44 cm = 0.44 meters. Total distance = 44 meters. Number of revolutions = 44 / 0.44 = 100.
Circumference of the wheel = 2 * (22/7) * 7 = 44 cm = 0.44 meters. Total distance = 44 meters. Number of revolutions = 44 / 0.44 = 100.
This question belongs to:
Maths
Time Speed and Distance
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